Shaking or jarring mechanism



May 28, 1968 A. E. BERGER SHAKING OR JARRING MECHANISM 2 SheetsSheet 1 Filed Oct. 18, 1966 Fig. 2

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United States Patent 3,385,119 SHAKWG 0R JARRING MECHANISM Anton Edward Berger, Wendlingen, Germany, assignor to Delmag-Maschinenfabrik Reinhold Darnfeld, Esslingen (Neckar), Germany Filed Oct. 18, 1966, Ser. No. 587,517 Claims priority, application Germany, Oct. 22, 1965,

D 48,486; Sept. 30, 1966, 1) 51,213

Ciaims. (CI. 74-61) The present invention relates to a mechanism, especially for use as a shaking, jarring, or compacting machine which comprises a pair of eccentric weight members which are rotatable simultaneously in opposite directions about the axes of two parallel shafts so as to produce jarring vibrations of the housing of the mechanism, and it is an object of the present invention to provide suitable means for infinitely varying the position of one of the eccentric members relative to the position of the other member and for thereby varying the phase relationship of the two eccentric members during the operation of the machine.

For attaining this object, the present invention provides a pair of parallel shafts each of which carries one of the eccentric members and a gear which is rigidly connected to and rotatable with the respective eccentric member, and a gear mechanism which connects these two gears to each other and a part of which is mounted on a rocker which is pivotable about the axis of one of the shafts to any angular position within a complete circle and thereby turns the eccentric member on this shaft about the axis of the latter to a corresponding position relative to and independently of the position of the other eccentric member on the other shaft. For effecting the turning of the first eccentric member relative to the other eccentric member, the first eccentric member is rigidly connected to a gear which meshes with another gear which is rotatably mounted on the rocker and is adapted when the rocker is being pivoted either directly or by means of an intermediate gear on the rocker to roll around another larger auxiliary gear which by means of other gear means or the like is connected to the other shaft carrying the other eccentric member. By this rolling motion of the gear which is mounted on the rocker, the gear which is connected to the first eccentric member is turned about its axis in accordance with the angle to which the rocker is pivoted, and by this turning movement, the first eccentric member is turned to a different eccentric position relative to that of the other eccentric member and entirely without affecting the relative position of the latter.

According to one preferred embodiment of the invention which is applicable if there is suflicient space available within the housing of the mechanism especially in the axial direction of the latter, a pair of parallel shafts is mounted on the rocker and a pair of gears is mounted on each of these shafts. One gear on the first of these shafts is the one which rolls around the larger auxiliary gear when the rocker is being pivoted, while the other gear on this shaft meshes with one of the gears on the second shaft. The second gear on the second shaft meshes with the gear which is rigidly connected to the first eccentric member. The first gear on this second shaft may be omitted if the second gear thereon meshes not only with the gear which is rigidly connected to the first eccentric member but also with the second gear on the first shaft. Even though this gear unit requires at least one additional gear, it is of a very simple construction and may therefore be made at a low cost.

Another embodiment of the invention is provided with a different gear design. The larger auxiliary gear which is freely rotatable on the shaft to which the first eccentric "ice member is secured is provided with external and internal teeth. The external teeth are connected by other gear means or the like to the gear on the shaft carrying the second eccentric member while the internal teeth mesh with a small gear which is located at the inside of the auxiliary gear and is rotatably mounted on the rocker and rolls along these internal teeth when the rocker is being pivoted. This small gear, in turn, meshes with the gear which is rigidly connected to the first eccentric member. It is evident that by mounting this last gear and the small gear on the rocker within the auxiliary gear, it is possible to make the entire mechanism of a very compact construction.

Although for some mechanisms according to the invention it may be sufficient to provide a simple manual control for adjusting the rocker to different angular positions and for locking it in any of these positions, it is advisable for other mechanisms, for example, those installed in soil compacting machines, to provide suitable hydraulic control means which may be secured to the housing of the machine and may be operated in a very simple manner from a remote point, for example, on the handle of the compacting machine.

The features and advantages of the present invention will become more clearly apparent from the following detailed description thereof which is to be read with reference to the accompanying drawings, in which:

FIGURE 1 shows a diagrammatic perspective view of the essential parts of a mechanism according to the inven tion for varying the phase relationship of two eccentricweight members;

FIGURE 2 shows a similar view of a modification of the invention; while FIGURE 3 shows, partly broken away, a side view of a soil compacting machine containing a mechanism ac cording to FIGURE 2.

The jarring mechanism according to the invention as illustrated in FIGURE 1 comprises a pair of parallel shafts 1 and 1' which are rotatably mounted in a housing, not shown. Shaft 1 carries an eccentric weight member 2 which is rigidly connected to a gear 3 and mounted together with this gear on shaft 1 so as to be freely rotatable thereon, while shaft 1 carries an eccentric weight member 2' which is rigidly secured to this shaft. Shaft 1 further carries a rocker 4 which is pivotably mounted thereon and provided with a handle 5 for manually pivoting the rocker 4 in either direction. By suitable means, not shown, this handle 5 may be locked in the particular position to which it has been adjusted.

Rocker 4 forms the bearings of a shaft 7 on which a gear 6 is secured which meshes with the larger gear 3 on the eccentric member 2. Another gear 6' which is likewise rigidly connected to shaft 7 and spaced from the gear 6 meshes with a reversing gear 8 which is secured on a saft 9 which is rotatably mounted on rocker 4 and extends parallel to shaft 7. Another reversing gear 8 which is likewise secured to shaft 9 meshes with an auxiliary gear 10 which is mounted on shaft 1 so as to be freely rotatable thereon. This auxiliary gear 10 has a sprocket wheel 11 secured thereto which is connected by a chain or toothed belt 12 to a sprocket wheel 11' which is secured to the shaft 1. Of course, either the auxiliary gear 10 together with the sprocket wheel 11 or the eccentric weight member 2 together with the gear 3 may also be rigidly secured to the shaft 1.

If the reversing gear 8 on shaft 9 meshes with gear 6 on rocker 4, the other gear 6' may be omitted. If desired, another pair of eccentric weight members, not shown, may also be mounted on the ends of shafts 1 and 1' opposite to those carrying the eccentric members 2 and 2. The mechanism may be driven either by shaft 1 or shaft 1 so that the different gears and eccentric members will turn in the directions as indicated by the arrows in FIGURE 1.

If the handle is pivoted in the direction of the arrow A about shaft 1, rocker 4 will be pivoted upwardly and the reversing gear 8' will roll around the auxiliary gear regardless of whether the mechanism is stopped or in operation. The amount of this rotation of gear 8 will be transmitted by gear 8 to the gears 6 and 6' on rocker 4 which will then turn gear 3 together with the eccentric member 2 in the direction as indicated by the arrows. Assuming the mechanism to be stopped so that the auxiliary gear 10 and thus also the sprocket gears 11 and 11 are stationary, the eccentric member 2 will then be turned to a different angular position relative to the position of the eccentric member 2. The two eccentric members may in this manner be adjusted to any angular positions relative to each other provided the control handle 5 has a length so as to permit it to be completely swung around without engaging upon the shaft 1'. Since rocker 4 may also be pivtoted while the shafts 1 and 1 are rotating, it is also possible to vary the relative angular positions of the two eccentric members 2 and 2 while they are rotating, that is, the phase relationship of these two members during the operation of the jarring mechanism.

In the jarring mechanism according to the modification of the invention as illustrated in FIGURE 2, all those parts which correspond to the parts as previously described are designated by the same reference numerals as in FIGURE 1 to which, however, another prime is added if the respective part is of a different shape or design. In t place of the eccentric weight member 2, according to FIG- URE l, a similar eccentric member 2" is rigidly secured to a shaft 1" to which a gear 3' is also secured. A rocker 4 is pivotably mounted on shaft 1" and is adapted to be pivoted in either direction by a handle 5. Suitable means, not shown, are also provided in this case for locking the handle 5' in the position to which it has been adjusted. A shaft 7 is rotatably mounted on the rocker 4' and carries a gear 6" which is freely rotatable thereon and meshes with the internal teeth of an auxiliary gear 10'. This gear 10' also has external teeth which mesh with those of an intermediate gear 12' which, in turn, meses with a gear 11" which is secured to shaft 1. Instead of rigidly securing the shaft 7 to the rocker 4' and mounting the gear 6" on this shaft so as to be freely rotatable thereon, it is, of course, also possible to secure the gear 6 to shaft 7 and to mount the latter on the rocker 4' so as to be rotatable.

When the handle 5' is pivoted in the direction of the arrow B while the auxiliary gear 10 is in a stationary position, gears 6 and 3 as well as the eccentric member 2 will be turned in the direction of the arrows which are marked thereon so that, if the handle 5' is made of a suitable design, the two eccentric members 2" and 2 may be adjusted to any desired angular position relative to each other within a complete revolution. The eccentric members may be driven either by means of the gear 12' or by one of the shafts 1" or 1. The desired adjustments of the angular positions of the two eccentric members 2" and 2' relative to each other may, of course, also be carried out in the same manner while the jarring mechanism is in operation.

FIGURE 3 illustrates the mechanism according to FIG- URE 3 installed in a soil compacting machine. This machine comprises a housing which consists of a lower trough-shaped jarring element 21 which is connected by a rubber suspension member 22 to an upper housing part 23 which carries an internal combustion engine 24. This engine 24 drives a pump 38, preferably a hydraulic pump, and it is connected by a suitable clutch, not shown, and by a belt 25 to a driving gear 26 which meshes with the intermediate gear 12. This gear 12 meshes with the gear 11 and the auxiliary gear 10' on the shafts 1 and 1 which extend parallel to the axis of the intermediate gear 12'.

While gear 11" is rigidly connected to shaft 1', the auxiliary gear 10 is freely rotatable on shaft 1".

Coaxially to the auxiliary gear 10' which is also provided with internal teeth, shaft 1" further carries rigidly thereon a smaller gear 3 which is connected with the internal teeth of gear 10 by another small intermediate gear 6". This gear 6 is mounted on a rocker in the form of a gear 4" which meshes with the teeth on a segmentally-shaped lever 27 which is pivotably mounted on a shaft 28 which carries the intermediate gear 12.

Another set of teeth on lever 27 meshes with a pinion 29 which may be driven in either direction by a rack which is secured to a piston which is movable in both axial directions within a hydraulic cylinder 30. This cylinder 30 is mounted by means of a connecting member 31 on the shaft 1' which carries the eccentric member 2 and the gear 11'', and the other end of this connecting member 31 is rigidly connected to a part 32 of the jarring trough 21.

The two ends of cylinder 30 are connected by supply lines 33 and 33' to a control device 34 which may be operated by hand and permits the cylinder 30 either to be shut off from the pump 38 or one end of this cylinder to be connected to the pump 38 and its other end to a fluid-supply tank 35 or vice versa. For protecting the pressure line coming from the pump 38 from an excessive pressure, a relief valve 39 may be connected to this line or directly to the pump 38.

The control device 34 is mounted on a steering arm 36 which is pivotally connected to the machine and also carries another control device 37 for the operation of the engine 24. The pivotability of the steering arm 36 requires the supply lines 32 and 33 to be flexible. The relative angular position of the two eccentric members 2 and 2 on shafts 1' and 1" may also be varied during the operation of the machine by a suitable actuation of the control device 34.

Although my invention has been illustrated and described with reference to the preferred embodiments thereof, I wish to have it understood that it is in no way limited to the details of such embodiments but is capable of numerous modifications within the scope of the appended claims.

Having thus fully disclosed my invention, what I claim 1. A shaking or jarring mechanism comprising a pair of parallel shafts laterally spaced from each other, an eccentric weight member on each shaft, a gear rigidly connected to and rotatable with each eccentric member, a rocker pivotably mounted on one of said shafts and adapted to be pivoted to any angular position within a complete circle, meshing gear means connecting said two gears to each other for rotating said eccentric members simultaneously in opposite directions, a part of said gear means being rotatably mounted on said rocker and pivotable therewith about said one shaft so as to turn the eccentric member about the axis of said shaft to a corresponding position relative to and independently of the position of the other eccentric member, and driving means connected to said gear means for driving said mechanism.

2. A mechanism as defined in claim 1, further comprising a housing containing said mechanism, adjusting means mounted on one of said shafts for varying the angular position of said rocker, first means for connecting said adjusting means to said rocker, and second means for rigidly connecting said adjusting means to said housing.

3. A mechanism as defined in claim 2, in which said first connecting means are mounted on a shaft of said gear means.

4. A mechanism as defined in claim 2, in which said adjusting means comprise a working cylinder having a piston slidable therein, means for supplying pressure medium to either side of said cylinder for moving said piston in either direction, a rack connected to said piston,

said rocker comprising a gear, said first connecting means comprising intermediate gear means connecting said rack to said rocker gear.

5. A mechanism as defined in claim 4, in which said pressure supply means comprise a pump adapted to be driven by said driving means and conduit means connecting said pump to both sides of said cylinder, and control means connected to said conduit means for controlling the operation of said piston in said cylinder.

6. A shaking or jarring mechanism comprising a shaft having a first axis, first gear means and a first eccentric Weight member mounted so as to be rotatable about said first axis, a second axis extending parallel to and laterally spaced from said first axis, second gear means rigidly connected to and rotatable with a second eccentric member about said second axis, a rocker mounted so as to be pivotable about said second axis and adapted to be arrested in any angular position, third gear means mounted on said rocker and rotatable about at least one third axis parallel to said first and second axes and being in engagement with said second gear means, fourth gear means rotatable about said second axis and in engagement with said third gear means, said third gear means being adapted to roll along said fourth gear means when said rocker is pivoted and thereby to be turned about said third axis and thereby adapted to turn said second gear means together with said second eccentric member about said second axis independently of said first eccentric member, means for driving said shaft, and intermediate gear means connecting said first gear means on said shaft to said fourth gear means so that when said shaft is driven in one direction, said eccentric members will rotate simultaneously in opposite directions.

7. A mechanism as defined in claim 6, in which said third gear means on said rocker comprise two shafts parallel to said first shaft, a pair of gears mounted on one of said two shafts, one gear of said pair meshing with and adapted to roll around said fourth gear means when said rocker is pivoted, and at least one gear mounted on the other of said two shafts and meshing with said second gear means and with the other gear of said pair.

8. A mechanism as defined in claim 6, in which said intermediate gear means comprise a chain connecting said first and fourth gear means to each other.

9. A mechanism as defined in claim 6, in which said fourth gear means comprise a gear having internal teeth meshing with said third gear means on said rocker.

10. A mechanism as defined in claim 6, in which said fourth gear means comprise a gear having internal and external teeth, said internal teeth meshing with said third gear means on said rocker and said external teeth meshing with said intermediate gear means which are in engagement with said first gear means on said shaft.

References Cited UNITED STATES PATENTS 2,206,386 7/ 1940 Bernhard 74-61 2,831,353 4/1958 Ongaro 74-61 2,892,353 6/ 1959 Harshberger 74-61 MILTON KAUFMAN, Primary Examiner. 

1. A SHAKING OR JARRING MECHANISM COMPRISING A PAIR OF PARALLEL SHAFTS LATERALLY SPACED FROM EACH OTHER, AN ECCENTRIC WEIGHT MEMBER ON EACH SHAFT, A GEAR RIGIDLY CONNECTED TO AND ROTATABLE WITH EACH ECCENTRIC MEMBER, A ROCKER PIVOTABLY MOUNTED ON ONE OF SAID SHAFTS AND ADAPTED TO BE PIVOTED TO ANY ANGULAR POSITION WITHIN A COMPLETE CIRCLE, MESHING GEAR MEANS CONNECTING SAID TWO GEARS TO EACH OTHER FOR ROTATING SAID ECCENTRIC MEMBERS SIMULTANEOUSLY IN OPPOSITE DIRECTIONS, A PART OF SAID GEAR MEANS BEING ROTATABLY MOUNTED ON SAID ROCKER AND PIVOTABLE THEREWITH ABOUT SAID ONE SHAFT SO AS TO TURN THE 